Among these latter patients, platelet apheresis (13 patients [4.1%]) was undertaken for emergent platelet control for between 1 to 8 sessions for platelet counts ranging from 870 × 10 9 /L to 2400 × 10 9 /L. All patients with thrombohemorrhagic complications (and thrombocytosis) had received some form of platelet-lowering therapy (Table 4 ....